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Thoughts on preparation of hydrogen-based reduction gas and process of direct reduction iron |
SHEN Feng-man1, ZHENG Ai-jun2, ZHENG Hai-yan1, WANG Xiao-ai3, LI Yang2, ZHANG Wei-ling4 |
1. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; 2. Xuanhua Iron and Steel Group Co., Ltd., Xuanhua 075100, Hebei, China; 3. Iron and Steel Research Institute, HBIS Group, Shijiazhuang 050024, Hebei, China; 4. Technique and Products Manufactruing Department, Baosteel Zhanjiang Iron and Steel Co., Ltd., Zhanjiang 524072, Guangdong, China |
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Abstract Optimizing and improving the preparation process of hydrogen based direct reduction iron is one of the effective ways to develop and implement carbon emission reduction in China. Therefore, hydrogen-based direct reduction iron process will have great development with the promotion of “carbon emission reduction” and “carbon neutralization”. This paper discussed and analyzed the difficult problems in the process of hydrogen-based gas direct reduction of iron from three aspects: iron containing raw materials, reduction gas preparation parameter selection and energy guarantee. Especially for the selection of reduction gas preparation parameters, an innovative graphical method for determining the process parameters of hydrogen-based reduction gas was proposed. This method was used to construct the "mass and chemical balance diagram of H-C-O system" and unify the expression of reducing gas by nH/nC and nO/nC. Through the introducing of ray nH2O/nCH4 scale passing through CO2 point, the nCO2/nCH4 scale parallel to line L1 (nH2O+nCH4>0、nCO2=0), and the straight line family of nH2/nCO isolines at different temperatures, and using " mass and chemical equilibrium diagram of H-C-O system", the existence domain of any composition gas could be clearly expressed, that means, the nH/nC and nO/nC of any composition gas could be clearly expressed. Using this method, the addition amount of nH2O or nCO2 or for 1 mol CH4 under a given nH2/nCO can be determined. For the process of preparing hydrogen-based reducing gas by reforming natural gas or coke oven gas, the process operating parameters (such as, addition amount and ratio) for preparing hydrogen-based reducing gas with a given nH2/nCO at a specified temperature can be easily determined by graphical method according to the gas source conditions, so as to provide a theoretical guiding basis for the selection of process parameters for preparing hydrogen-based reducing gas.
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Received: 01 September 2021
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